{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nRecent studies in muscle biology have elucidated key signaling pathways regulating transcription and function of contractile proteins. For instance, work using cultured cardiac myocytes and genetic models has revealed that the developmental switching of troponin I isoforms and disruptions in troponin I function can markedly affect contractility and calcium sensitivity in muscle fibers."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": " These findings underscore the importance of precise transcriptional and post‐translational control in ensuring proper muscle adaptation and contractile performance.\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nOther investigations have expanded on these themes by characterizing upstream regulatory domains and the impact of hormonal signals on gene expression in myocardial cells, as well as exploring the interactions of key regulatory peptides with myofilament proteins to modulate force generation and relaxation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": " Complementary studies also demonstrated how changes in signaling proteins such as Galphaq can result in altered Ca²⁺ sensitivity and myofilament performance, offering insight into mechanisms reminiscent of those observed in heart failure."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nDespite the comprehensive characterization of muscle-specific gene regulation, contractile protein function, and Ca²⁺ signaling in these reports, none of the provided abstracts address or mention STEAP2‑AS1. Therefore, while these studies deepen our understanding of muscle plasticity and functional modulation, they do not offer any direct evidence about the function of STEAP2‑AS1. Future research is necessary to determine whether STEAP2‑AS1 plays a regulatory role in similar signaling cascades or gene networks implicated in muscle adaptation, as suggested by its genomic context.\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nThe current body of work reflects the intricate interplay of transcriptional and post-translational mechanisms in muscle physiology; however, the functional contributions of STEAP2‑AS1 remain uncharacterized in these studies."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Beth Riedel, Yuanyuan Jia, Jianfeng Du, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Thyroid hormone inhibits slow skeletal TnI expression in cardiac TnI-null myocardial cells."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Tissue Cell (2005)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.tice.2004.10.002"}], "href": "https://doi.org/10.1016/j.tice.2004.10.002"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "15695175"}], "href": "https://pubmed.ncbi.nlm.nih.gov/15695175"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Patti L Engel, Tomoyoshi Kobayashi, Brandon Biesiadecki, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Identification of a region of troponin I important in signaling cross-bridge-dependent activation of cardiac myofilaments."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Biol Chem (2007)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1074/jbc.M512337200"}], "href": "https://doi.org/10.1074/jbc.M512337200"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "17099250"}], "href": "https://pubmed.ncbi.nlm.nih.gov/17099250"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Nevenka Juretić, Ulises Urzúa, David J Munroe, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Differential gene expression in skeletal muscle cells after membrane depolarization."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Cell Physiol (2007)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1002/jcp.20902"}], "href": "https://doi.org/10.1002/jcp.20902"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "17146758"}], "href": "https://pubmed.ncbi.nlm.nih.gov/17146758"}]}, {"type": "r", "ref": 4, "children": [{"type": "t", "text": "J Du, C Nan, J J Huang, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Functional characterization of mouse fetal TnI gene promoters in myocardial cells."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Biomed Sci (2008)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1007/s11373-008-9246-y"}], "href": "https://doi.org/10.1007/s11373-008-9246-y"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "18357515"}], "href": "https://pubmed.ncbi.nlm.nih.gov/18357515"}]}, {"type": "r", "ref": 5, "children": [{"type": "t", "text": "C Pott, L Willkomm, S Grafweg, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Reduced troponin I phosphorylation and increased Ca(2+)-dependent ATP-consumption in triton X-skinned fiber preparations from Galphaq overexpressor mice."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Mol Cell Biochem (2008)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1007/s11010-008-9774-9"}], "href": "https://doi.org/10.1007/s11010-008-9774-9"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "18473122"}], "href": "https://pubmed.ncbi.nlm.nih.gov/18473122"}]}, {"type": "r", "ref": 6, "children": [{"type": "t", "text": "Felipe Hornos, Han-Zhong Feng, Bruno Rizzuti, et al. "}, {"type": "b", "children": [{"type": "t", "text": "The muscle-relaxing C-terminal peptide from troponin I populates a nascent helix, facilitating binding to tropomyosin with a potent therapeutic effect."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Biol Chem (2021)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1074/jbc.RA120.016012"}], "href": "https://doi.org/10.1074/jbc.RA120.016012"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "33814345"}], "href": "https://pubmed.ncbi.nlm.nih.gov/33814345"}]}]}]}